🏡 Correct RTL behaviour for More button.

By setting layout_gravity to include start, the containing FrameLayout
will position the More button correctly on RTL devices.

Bug: 789752
Change-Id: Ifa5b1c6af7639f466ebf75224b75e694c9a88366
Reviewed-on: https://chromium-review.googlesource.com/803476Reviewed-by: Nicolas Dossou-Gbété <dgn@chromium.org>
Commit-Queue: Peter Conn <peconn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521308}

chrome/android/java/res/layout/new_tab_page_action_card.xml

@@ -19,7 +19,7 @@
         android:id="@+id/action_button"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_gravity="center_vertical"
+        android:layout_gravity="center_vertical|start"
         android:text="@string/more" />
 
     <org.chromium.chrome.browser.ntp.cards.ProgressIndicatorView